♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/stringify-entities/lib/index.d.ts

@@ -1,24 +0,0 @@
-/**
- * Encode special characters in `value`.
- *
- * @param {string} value
- *   Value to encode.
- * @param {Options} [options]
- *   Configuration.
- * @returns {string}
- *   Encoded value.
- */
-export function stringifyEntities(value: string, options?: Options | undefined): string;
-/**
- * Encode special characters in `value` as hexadecimals.
- *
- * @param {string} value
- *   Value to encode.
- * @param {LightOptions} [options]
- *   Configuration.
- * @returns {string}
- *   Encoded value.
- */
-export function stringifyEntitiesLight(value: string, options?: import("./core.js").CoreOptions | undefined): string;
-export type Options = import('./core.js').CoreOptions & import('./util/format-smart.js').FormatSmartOptions;
-export type LightOptions = import('./core.js').CoreOptions;